Apparatus for knock detection with digital signal analysis and method of detecting knock using same

US6529817B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Oskar Torno · Schwieberdingen, DE
• Axel Heinstein · Welzheim, DE
• Carsten Kluth · Stuttgart, DE
• Werner Haeming · Neudenau, DE

Key dates

• Filing date: Jan 22, 2001
• Grant date: Mar 4, 2003
• Expiry date: Jan 22, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L23/225
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The apparatus detects knock in an internal combustion engine with at least one knock sensor associated with a cylinder of the internal combustion engine. The apparatus initially processes the analog knock sensor output signals in an analog signal preparing device (18), which can include a multiplexer and analog/digital converter, but the actual knock detection occurs only in a purely digital signal analysis device (19), which processes the prepared and digitized knock sensor output signals. The digital signal analysis device (19) extracts at least one knock index and compares it with predetermined threshold values for knock detection, preferably considering a reference value for knock-free operation. A method of detecting knock is also described which is based on the use of this apparatus.